To reproduce
sudo $(which ipython)

import ps_mem
ps_mem.main()

prints to STDOUT the table, but says about STDOUT:

Error in sys.excepthook:

Original exception was:

Using
Kubuntu 18.04
Linux 5.0.x
iPython 7.12.0
python 3.6.9

However, in python 3 default interpreter works without a crash.